Log Message:
-----------
Fix bug in the tsvector stats collection function, which caused a crash if
the sample contains just a one tsvector, containing only one lexeme.
Modified Files:
--------------
pgsql/src/backend/tsearch:
ts_typanalyze.c (r1.2 -> r1.3)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/tsearch/ts_typanalyze.c?r1=1.2&r2=1.3)